Home / 9,999.20-13,791.80-6,640.32

Finding the Fourth Proportional to 9,999.20, 13,791.80 and 6,640.32

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Solution

The fourth proportional to 9,999.20, 13,791.80 and 6,640.32 is: 9,158.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,999.20 : 13,791.80 = 6,640.32 : x
  2. Step 2: Convert to fraction form
    9,999.20/13,791.80 = 6,640.32/x
  3. Step 3: Cross multiply
    9,999.20x = 13,791.80 × 6,640.32
  4. Step 4: Simplify right side
    9,999.20x = 91,581,965.38
  5. Step 5: Solve for x
    x = 91,581,965.38/9,999.20
  6. Step 6: Final answer
    x = 9,158.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.